URL in description and README broken

The URL in the repository description and README are pointing to githubschool's copy of the game instead of yours.

Please fix both so they point to your copy of the game at https://githubschool.github.io/github-games-ychen157

Inspect the README and the repository description, which are the two locations named in the issue. Update both URLs to https://githubschool.github.io/github-games-ychen157, then verify that each location points to that exact game copy.

索引モデルが issue の本文から書いたものです。